Blog

In Spark, .cache() is a convenience method that calls .persist(…) with what setting?

A cube of an unknown metal measures 0.200 cm on one side. The mass of the cube is 71.7 mg. Which of the following is most likely the unknown metal?

I understand the rules of this exam, and that breaking these rules is academic dishonesty: Students are not allowed to communicate with other students about this exam until after the due date. Besides your own personal handwritten notes, students are not allowed to use other resources (books, websites, apps, etc) during the exam.  Students are not allowed to post the exam questions or answers online. 

Which of the following is the fundamental data structure of Spark?

What does this MapReduce job compute?

Name That Distribution! If U1 and U2 are i.i.d. Unif(0,1), what’s the distribution of 2(U1 + U2 + 1)?

Builtrite Furniture produced revenues of $2,500. It has COGS of $1100 and operating expenses (excluding depreciation) of $600, depreciation of $130, current assets of $210, wages payable of $30 and interest expense of $40. Its tax rate is 21 percent. What is the firm’s net income after taxes?

 Which method creates a Hive table from a DataFrame?

For a MapReduce job, you have 1000 input key/value pairs, 384 intermediate key/value pairs, and 31 output key/value pairs. Among the inputs there are 14 unique keys. How many times will map(…) be called?

Builtrite has operating expenses of $56, current assets of $150 and common stock of $140.  The firm also has net fixed assets of $480 and current liabilities worth $62 and long-term debt of $180.   What are Builtrite’s retained earnings?